feat(app-webpack): add ESLint 10 to peerDependencies #18305

Thanks for raising this. Since this discussion was opened, Quasar has announced that @quasar/app-webpack is being sunset. Version 4 is now in maintenance mode: it will receive critical bug and security fixes for the time being, but no new features. New CLI work is being focused on @quasar/app-vite.

Expanding the peer range and validating the Webpack integration against a new ESLint major would be new compatibility work rather than a critical fix. For an existing app-webpack project, the supported choice is therefore to remain on ESLint 9. Using --legacy-peer-deps merely bypasses the declared compatibility contract; it does not make ESLint 10 an officially tested combination.

For projects moving to current Quasar tooling, the recommended path is to migrate to @quasar/app-vite and use the Oxlint + Oxfmt option. Quasar itself has moved its linting and formatting to that toolchain. The app-vite v3 scaffolder still offers ESLint 9 + Prettier as an alternative, but it does not currently offer or validate ESLint 10. The Webpack-to-Vite migration guide covers the build-system migration.

Given that roadmap, I would treat this request as superseded by the app-webpack sunset rather than add ESLint 10 support to app-webpack.